On a nose-picking day, this came to mind!

It seemed like a normal Spring morning in the Gregory household. But what Mrs. Gregory found on the doorstep that morning was definitely not milk.

It was an enormous baby-rhinoceros-sized thing.

It had one gigantic eye and two horns, and only knew one word - 'GREAT'.

The family named this thing Gruvel.

How did Gruvel come to be on the Gregorys' doorstep? Where has Gruvel come from? And what on earth are they going to do with Gruvel? As the family try to answer these questions, Gruvel teaches them a wonderful lesson and makes a lot of mess in the process!